Method for efficiently degrading polyvinyl alcohol material

A polyvinyl alcohol, high-efficiency technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve the problems of PVA degradation and low PVA concentration, so that it is not easy to secondary pollution, oxidant The effect of small amount and high efficiency degradation

Inactive Publication Date: 2017-07-21
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, advanced oxidative degradation technology has attracted widespread attention in the treatment of refractory toxic organic pollutants. At present, the research on the degradation of PVA is mainly aimed at the research of PVA-contain

Method used

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  • Method for efficiently degrading polyvinyl alcohol material
  • Method for efficiently degrading polyvinyl alcohol material
  • Method for efficiently degrading polyvinyl alcohol material

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0041] Example 1

[0042] The steps of degradation treatment by the present invention are as follows:

[0043] 1. Pretreatment of PVA material (1799 yarn): Weigh 5g of PVA material at room temperature, add deionized water, swell for 2 hours, then heat to 60℃, keep stirring and dissolve, after dissolution is complete, water will dissolve The volume of the liquid is adjusted to 100ml.

[0044] 2. Add 100ml of the pretreated PVA solution into the reactor, adjust the pH of the solution with hydrochloric acid to 4, and slowly add 60ml of 30% hydrogen peroxide and 30% ferrous nitrate solution while rotating and stirring. 40ml, the adding rate of hydrogen peroxide and ferrous nitrate solution are 15ml / h and 10ml / h respectively, the molar ratio of hydrogen peroxide to ferrous nitrate is 8.81:1, and oxidative degradation is performed at 60°C for 1 hour.

[0045] 3. Add 20ml of sodium hydroxide solution with a mass concentration of 20% to the solution after oxidative degradation to adjust the ...

Example Embodiment

[0048] Example 2

[0049] The steps of degradation treatment by the present invention are as follows:

[0050] 1. Pretreatment of PVA material (1799 yarn): Weigh 15g of PVA material at room temperature, add deionized water, swell for 2 hours, then heat to 90℃, keep stirring and dissolve, after the dissolution is complete, dissolve the solution Make the volume to 100ml.

[0051] 2. Add 100ml of the pretreated PVA solution into the reactor, adjust the pH of the solution with sulfuric acid to 3, and slowly drop 120ml of 15% hydrogen peroxide and 25% ferrous chloride while rotating and stirring. The solution is 40ml, the oxidant and catalyst are added at 30ml / h and 10ml / h, the molar ratio of hydrogen peroxide to ferrous nitrate is 7.50:1, and the oxidative degradation is carried out at 80°C for 2 hours.

[0052] 3. Add 30ml of sodium hydroxide solution with a mass concentration of 20% to the solution after oxidative degradation, and adjust the pH of the solution to alkaline (above 9). S...

Example Embodiment

[0054] Example 3

[0055] The steps of degradation treatment by the present invention are as follows:

[0056] 1. Pretreatment of PVA material (1799 yarn): Weigh 8g of PVA material at room temperature, add deionized water, swell for 2 hours, then heat to 80℃, keep stirring and dissolve, after dissolving completely, dissolve the solution Make the volume to 100ml.

[0057] 2. Add the pretreated 100ml PVA solution into the reactor, adjust the pH of the solution with nitric acid to 5, and slowly add 60ml of 30% hydrogen peroxide and 15% ferrous bromide solution while rotating and stirring. 80ml, the adding rate of oxidant and catalyst were 20ml / h and 10ml / h, the molar ratio of hydrogen peroxide to ferrous nitrate was 10:1, and the oxidative degradation was performed at 50°C for 1 hour.

[0058] 3. Add 20ml of sodium hydroxide solution with a mass concentration of 20% to the solution after oxidative degradation to adjust the pH of the solution to alkaline (above 9). Settling and filterin...

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Abstract

The invention discloses a method for efficiently degrading a polyvinyl alcohol material. The method specifically comprises the following steps: swelling PVA at normal temperature, heating and dissolving the PVA, and adjusting the pH of a dissolving solution to 3 to 5; under a condition of constant temperature of 40 to 90 DEG C, adding an oxidant and a catalyst drop by drop while stirring, and performing reaction for 1 to 5 hours; adding a sodium hydroxide solution into the degraded solution to adjust the pH of the solution to be 9 to 13, performing sedimentation and filtration, and recycling iron sludge. The method is easy to operate; the oxidant and the catalyst both are conventional medicines, wide in source and low in cost; by the improvement on the adding mode and the ratios of the oxidant and the catalyst, degradation of the polyvinyl alcohol material which is a waste solid is realized; the PVA is degraded into a small-molecular-weight organic matter which has the molecular weight less than or equal to 500 g/mol and is easy to degrade; the organic matter at the molecular weight level is easily subjected to further biological degradation, thermal cracking and the like and is easy to treat; and no secondary pollution is caused.

Description

technical field [0001] The invention belongs to the technical field of processing high molecular weight polymer materials, in particular to a method for efficiently degrading polyvinyl alcohol materials. Background technique [0002] Polyvinyl alcohol (PVA) is an important chemical synthetic material with good water solubility and chemical resistance, and is widely used in printing and packaging, chemical fiber, clothing and other fields. However, its poor biodegradability greatly increases the difficulty of processing PVA waste materials. The recycling of discarded PVA chemical fiber products and clothing is also a thorny problem. At present, the processing of PVA waste materials is mainly divided into two parts, one part is recycled, processed and reused, but the recycling cost caused by this method is relatively high. Most enterprises unwilling to proceed. The other part is to carry out "put into the ground for safety" type of landfill, resulting in a lot of waste of sp...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/34
CPCC02F1/001C02F1/02C02F1/66C02F1/722C02F1/725C02F9/00C02F2101/34
Inventor 高强葛明桥王阳毅
Owner JIANGNAN UNIV
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